media_file_delete should delete field_data attached to media entity

Hi,

the function media_file_delete should as pointed out in the comment within it use the following code

$media = media_load($file->fid);
module_invoke_all('entity_delete', $media, 'media');
field_attach_delete('media', $media);

to delete the attached field data of the entity. The media_browser_plus module for instance uses EntityFieldQuery to load media entities which returns positive hits containing deleted entity_ids if there is still field data that you query against.

I'll add the patch in a few minutes.